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一、双向循环钻机的工作原理水流从钻杆中空压入孔内,再从钻杆与孔壁之间的环状间隙流出孔外,叫做正循环。反之,水流从孔口注入孔内,再从钻杆中空抽吸出孔外,叫做反循环(见图1)。双向循环钻机在反循环钻进时,从孔口向孔内注水,始终使孔内水位保持在孔口30～40厘米处,回转着的钻杆带动三翼钻头刮削地层,通过砂石泵的抽吸,循环水流携带着松动后的地层颗粒,经过钻头、圆钻杆、方钻杆、水接头、钢丝胶管、砂石泵、出水管而落到回水筛上,砂
First, the principle of two-way circular drilling rig water flow from the drill hole into the hole, and then from the ring gap between the drill pipe and the hole out of the hole, called the positive cycle. Conversely, the flow of water from the orifice into the hole, and then out of the hole from the hollow drill pipe, called the reverse cycle (see Figure 1). During the reverse circulation drilling, the bidirectional circular drilling rigs inject water from the orifices into the holes, always keeping the water level in the holes at 30 to 40 cm in the orifices, and the rotating drill rod drives the three-wing bit to scrape the formation through the gravel pump. Suction, circulating water carrying the loosened formation particles, passing through the drill, round drill pipe, kelly, water joint, steel hose, sand pump, outlet pipe and falling onto the backwater screen, sand